JP3429842B2 - Image information detection device for video signal - Google Patents
Image information detection device for video signalInfo
- Publication number
- JP3429842B2 JP3429842B2 JP07709194A JP7709194A JP3429842B2 JP 3429842 B2 JP3429842 B2 JP 3429842B2 JP 07709194 A JP07709194 A JP 07709194A JP 7709194 A JP7709194 A JP 7709194A JP 3429842 B2 JP3429842 B2 JP 3429842B2
- Authority
- JP
- Japan
- Prior art keywords
- image
- video signal
- image information
- range
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
- H04N7/0117—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level involving conversion of the spatial resolution of the incoming video signal
- H04N7/0122—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level involving conversion of the spatial resolution of the incoming video signal the input and the output signals having different aspect ratios
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/16—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/20—Circuitry for controlling amplitude response
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Graphics (AREA)
- Television Systems (AREA)
- Picture Signal Circuits (AREA)
- Controls And Circuits For Display Device (AREA)
- Television Receiver Circuits (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、テレビジョンの画質改
善を行う場合に用いる映像信号の画像情報検出装置に関
するものである。
【０００２】
【従来の技術】近年、カラーテレビジョン受像機は画面
の大型化に伴い、映像のつぶれ・黒浮きを防止し階調性
を向上してより高画質な映像を実現するために各種画質
補正装置が重要視されている。
【０００３】以下、図面を参照しながら、上述した従来
の画質補正装置の一例について説明を行う。
【０００４】図６は従来の画質補正装置の一つである黒
レベル補正回路の特性図を示すものである。入力信号を
輝度信号とした場合、図６の横軸は黒レベル補正回路の
入力信号レベルで、縦軸は出力信号レベルであり、１は
入力信号の最小輝度レベル、２は補正処理をしない場合
すなわち入力した信号の輝度レベルと同じ輝度レベルで
信号を出力する場合の入出力特性、３は黒レベル補正処
理後の入出力特性を示す。
【０００５】以上の画質補正装置例の黒レベル補正回路
について、以下その動作を特性図を用いて説明する。
【０００６】図６の黒レベル補正回路の特性図におい
て、符号Ａのような最小輝度レベルがある場合、このま
までは黒が浮いたような画面になる。そこでこの映像の
階調性を向上させるには、この最小輝度レベルを入力時
よりもレベルが低く、黒レベル補正によるレベル変動の
無いペデスタルレベル付近まで引き下げて出力すればよ
い。これを図６の特性図で説明すると、符号Ｂの無補正
の特性波形の傾きを立てて、最小輝度レベルがペデスタ
ルレベル付近になるように補正することになる。この補
正後の入出力特性波形が符号Ｃである。このように黒レ
ベル補正回路で輝度信号を処理することで黒浮きを防止
し、黒部分の階調性を向上することができる。この補正
の効果は平均輝度レベル（Ａｖｅｒａｇｅ Ｐｉｃｔｕ
ｒｅ Ｌｅｖｅｌ、以下ＡＰＬと記載）が高くなるほど
強くなるように制御される。
【０００７】
【発明が解決しようとする課題】しかしながら上記のよ
うな回路では、図７のようにアスペクト比が４：３の表
示画面にビスタサイズなどの横長のアスペクト比の映像
信号を入力した際の画面上下に黒帯のある映像の場合
や、図８のようにアスペクト比が１６：９の表示画面に
アスペクト比が４：３の映像信号を入力した際の画面左
右にサイドパネルのある映像の場合には誤動作する場合
がある。その原因は、黒レベル補正を行うために必要な
最小輝度レベルやＡＰＬ検出電圧といった画像情報の検
出処理を図７及び図８の符号ａで示す実際に映像信号が
ある範囲内で行わなければならないのに、ａの範囲以外
の画面上下又は左右の黒帯部分でも検出処理してしまう
ことである。例えば最小輝度レベル検出回路が映像信号
の最小輝度レベルを検出せずに黒帯部分の輝度レベルを
検出してしまったり、ＡＰＬ検出電圧が本来の検出電圧
より低い電圧になってしまったりすることがある。この
検出回路の誤動作のため、黒レベル補正が正常に動作し
ないという問題点を有していた。
【０００８】本発明は上記問題点に鑑み、表示画面とア
スペクト比の異なる映像信号を入力した場合でも正常な
画像情報検出を行うことの出来る映像信号の画像情報検
出装置を提供するものである。
【０００９】
【課題を解決するための手段】上記課題を解決するため
に、本発明の映像信号の画像情報検出装置は、アスペク
ト比が１６：９になるように固定してあらかじめ設定し
た水平位置と垂直位置を使用して入力映像信号から画像
情報の検出を行う範囲を出力する第１の画像範囲出力回
路と、前記入力映像信号の輝度レベルを判定し、画面上
下又は左右に黒帯部分があるかを判定し、前記入力映像
信号の画面上下又は左右に黒帯部分がない場合には全表
示画面に対する入力映像信号から画像情報の検出を行う
範囲を出力し、前記入力映像信号の画面上下又は左右に
黒帯部分がある場合には前記入力映像信号から画面上下
又は左右の黒帯部分を除いた映像部分の前記表示画面に
対する水平位置と垂直位置を検出して入力映像信号から
画像情報の検出を行う範囲を出力する第２の画像範囲出
力回路と、前記第１の画像範囲出力回路又は第２の画像
範囲出力回路から出力される第１の画像範囲信号又は第
２の画像範囲信号の画像範囲出力の範囲内で入力映像信
号から画質補正に必要な画像情報を検出する画像情報検
出回路と、検出された画像情報を用いて入力映像信号を
最適な画質に補正する画質補正回路と、入力映像信号の
アスペクト比が１６：９のＥＤＴＶ２の映像信号か否か
を識別信号の有無により判定する判別回路とを備え、前
記判別回路において、入力映像信号のアスペクト比が１
６：９のＥＤＴＶ２の映像信号であることを示す識別信
号が無しと判定された時には、前記第２の画像範囲出力
回路から出力される第２の画像範囲出力の範囲内で入力
映像信号から画質補正に必要な画像情報を検出し、前記
判別回路において、入力映像信号のアスペクト比が１
６：９のＥＤＴＶ２の映像信号であることを示す識別信
号が有りと判定された時には、入力映像信号のアスペク
ト比と表示画面のアスペクト比と異なるか同じであるか
に関わらず、前記第１の画像範囲出力回路から出力され
るあらかじめ設定された第１の画像範囲内で入力映像信
号から画質補正に必要な画像情報を検出するようにした
ものである。
【００１０】
【作用】本発明は上記した構成によって、まず入力した
映像信号から画面上下又は左右の黒帯部分を除いた本来
の映像部分の範囲を画像範囲出力回路から出力し、この
範囲内で入力信号から最小輝度レベルなどの画質補正に
必要な各種画像情報を画像情報検出回路により検出す
る。この検出データを用いて最適な画質になるように画
質補正回路で入力信号を補正して出力する。また、ＥＤ
ＴＶ２判別回路により入力信号のＥＤＴＶ２識別信号の
有無を検出し、この識別信号がある場合（ＥＤＴＶ２映
像受信時）はアスペクト比を１６：９に固定した画像範
囲を画像範囲出力回路から出力して、この範囲内で入力
信号から各種画像情報を画像情報検出回路により検出
し、このデータを用いて画質補正回路で入力信号を補正
して出力する。このようにして表示画面と異なるアスペ
クト比の映像信号が入力された場合でも正常な画像情報
の検出を行うことの出来る映像信号の画像情報検出装置
を構成することができる。
【００１１】
【実施例】以下、本発明の実施例の映像信号の画像情報
検出装置について、図面を参照しながら説明する。
【００１２】（実施例１）図１は本発明の第１の実施例
における映像信号の画像情報検出装置のブロック構成図
を示すものである。図１において、１は画像範囲出力回
路であり、あらかじめ設定した水平位置と垂直位置から
画像情報を検出する範囲を決定し、画像範囲出力ｂを出
力する。２は画像情報検出回路であり、画像範囲出力ｂ
の範囲内で映像信号ａから画像情報を検出して画像情報
検出データｃを出力する。３は画質補正回路であり、画
像情報検出データｃを用いて映像信号ａを最適な画質に
補正する。 以上のように構成された映像信号の画像情
報検出装置について、以下図１を用いてその動作を説明
する。画質補正に必要な画像情報を検出するためには、
画像情報検出の範囲を指定する必要がある。そこで図１
の画像範囲出力回路１にはあらかじめ表示画面の全面で
検出が行えるような水平位置と垂直位置が設定されてい
る。この位置を基に画像情報検出の範囲を決定して画像
範囲出力ｂを出力し、この範囲内で入力映像信号ａから
各種の画像情報を画像情報検出回路２で検出し得られた
検出結果を画像情報検出データｃとして出力する。３は
画質補正回路であり、画像情報検出データｃを用いて映
像信号ａを最適な画質に補正して映像信号出力ｄを出力
する。
【００１３】以上のように本実施例によれば、画像情報
出力回路から出力された画像範囲を用いて画像情報検出
回路を行い、画質補正回路で映像信号を補正して出力す
ることで、最適な画像情報検出を行うことの出来る映像
信号の画像情報検出装置を提供することができる。
【００１４】（実施例２）以下本発明の第２の実施例に
ついて図面を参照しながら説明する。図２は本発明の第
２の実施例における映像信号の画像情報検出装置のブロ
ック構成図を示すものである。図２において、１は画像
範囲出力回路であり、入力した映像信号ａから黒帯部分
を除いた画像部分を検出しこれを画像範囲出力ｂとして
出力する。２は画像情報検出回路であり、画像範囲出力
ｂの範囲内で入力映像信号ａから各種の画像情報を検出
して画像情報検出データｃを出力する。３は画質補正回
路であり、画像情報検出データｃを用いて映像信号ａを
最適な画質に補正して映像信号出力ｄを出力する。
【００１５】以上のように構成された映像信号の画像情
報検出装置について、以下図２、図３を用いてその動作
を説明する。
【００１６】まず図３は表示画面と入力された映像との
関係を示す。Ａ１は表示画面を示し、Ａ２は表示画面と
異なるアスペクト比の映像を入力した場合の画像範囲を
示す。ここで表示画面と同じアスペクト比の映像信号が
入力されると、水平・垂直共に画面の端から端まで映像
がある状態なので前記第１の実施例と同様に表示画面の
全面（図３のＡ１の範囲）で入力信号の画像情報検出を
行えば良いが、異なるアスペクト比の映像信号を入力し
たときは実際の画像はＡ２の範囲にしかなく、それ以外
の図３の斜線部分には映像がない（映像信号レベルがペ
デスタルレベルと同一）。この状態でＡ１の範囲で画像
情報検出を行うと斜線部はすべて「黒」と判断して検出
してしまう。例えば入力映像の最小輝度レベルを検出す
る場合に図３のＡ２の範囲の映像部分の最小輝度レベル
よりも斜線部の輝度レベルのほうが低い時はこの斜線部
の輝度をこの映像の最小輝度レベルとして検出してしま
ったり、入力映像のＡＰＬを検出する場合には斜線部も
黒い映像部分として検出してしまい本来のＡ２の範囲の
画像のＡＰＬより低いＡＰＬ検出値となってしまうの
で、この斜線部では画像情報検出動作を停止する必要が
ある。そこで入力された映像信号ａの輝度レベルを判定
し、画面上下又は左右に連続した黒い部分がある場合は
これを図３の斜線部に相当する部分であると判断し、こ
れを除いた実際に画像があるＡ２の範囲の水平位置と垂
直位置を画像範囲出力回路１で検出する。Ａ２の範囲が
変化した場合はその都度水平位置と垂直位置を検出し常
に入力信号の画像部分のみを検出するようにして、この
検出結果を画像範囲出力ｂとして出力する。この出力デ
ータの範囲内で画像情報検出を画像情報検出回路２で行
い、検出データの範囲以外では画像情報検出を行わない
ようにする。ここで得られた検出結果を画像情報検出デ
ータｃとして出力し、このデータを基に映像信号ａを画
質補正回路３で最適な画質に補正して映像信号出力ｄを
出力する。
【００１７】以上のように本実施例によれば、画像範囲
出力回路で得られた入力画像に応じた画像範囲出力を用
いて画像情報検出回路を行い、画質補正回路で映像信号
を補正して出力することで、表示画面と異なるアスペク
ト比の映像信号を入力した場合でも最適な画像情報検出
を行うことの出来る映像信号の画像情報検出装置を提供
することができる。
【００１８】（実施例３）以下本発明の第３の実施例に
ついて図面を参照しながら説明する。図４は本発明の第
３の実施例における映像信号の画像情報検出装置のブロ
ック図を示すものである。図４において、４はＥＤＴＶ
２判別回路であり、入力された映像信号がＥＤＴＶ２か
どうかを判別して結果をＥＤＴＶ２判別データｈとして
出力する。１は画像範囲出力回路であり、ＥＤＴＶ２判
別データｈから入力映像信号がＥＤＴＶ２であると判定
した場合は画像情報検出を行う画像範囲のアスペクト比
を１６：９に固定して画像範囲出力ｂを出力する。２は
画像情報検出回路であり、画像範囲出力ｂの範囲内で映
像信号ａから画像情報を検出して画像情報検出データｃ
を出力する。３は画質補正回路であり、画像情報検出デ
ータｃを用いて映像信号ａを最適な画質に補正して映像
信号出力ｄを出力する。
【００１９】以上のように構成された映像信号の画像情
報検出装置について、以下図４及び図５を用いてその動
作を説明する。図４の画像範囲出力回路１では第１及び
第２の実施例と同様に画像範囲出力ｂを出力するが、入
力する映像によってはこの範囲検出が誤動作し実際の画
像と異なる範囲を出力することがある。例えば表示画面
と入力映像のアスペクト比が一致している場合に図５の
ように夜空に月が出ているようなシーンでは、図３の斜
線部分に相当する部分がないにもかかわらず月の上下左
右の夜空の部分を斜線部分として判別してしまうため
に、誤った画像範囲出力を画像範囲出力回路１から出力
してしまうことがあるが、もしあらかじめ入力映像信号
のアスペクト比がわかっている場合には画像範囲出力ｂ
をこのアスペクト比に合わせて出力することでこのよう
な誤動作を防止することができる。ここでアスペクト比
が一定でその他の部分に映像がない入力信号としてＥＤ
ＴＶ２信号がある。ＥＤＴＶ２信号はアスペクト比が１
６：９と定められており、またＥＤＴＶ２信号には垂直
帰線期間の２２Ｈと２８５ＨにＥＤＴＶ２識別制御信号
が挿入されている。この制御信号を解読するとＥＤＴＶ
２識別信号が検出できる。このＥＤＴＶ２識別信号でＥ
ＤＴＶ２かどうかを判別することが可能である。そこ
で、図４のＥＤＴＶ２判別回路で入力映像信号ａからＥ
ＤＴＶ２識別信号を検出し、ＥＤＴＶ２かどうかを判別
してＥＤＴＶ２判別データｈを出力する。この判定結果
から入力映像信号がＥＤＴＶ２だと判断できる場合は画
像範囲出力回路１からアスペクト比が１６：９に固定さ
れた画像範囲出力ｂを出力し、入力する映像による画像
範囲検出の誤動作を防止している。ＥＤＴＶ２以外の映
像が入力されたときの画像範囲出力回路１から画質補正
回路３までの動作は第１の実施例及び第２の実施例と同
一である。
【００２０】以上のように本実施例によれば、ＥＤＴＶ
２判別回路で入力信号がＥＤＴＶ２信号であると判別し
た場合には、アスペクト比が１６：９の画像範囲出力を
画像情報出力回路から出力し、この画像範囲データを用
いて画像情報検出回路を行い、画質補正回路で映像信号
を補正して出力することで、ＥＤＴＶ２映像信号入力時
には画像範囲検出の誤動作を防止し、常に安定した画像
情報検出を行うことの出来る映像信号の画像情報検出装
置を提供することができる。
【００２１】なお、第１、第２及び第３の実施例におい
て入力信号は映像信号としたが、これは輝度信号、色信
号、色差信号、又は原色信号でも良い。また同様に画像
情報検出は例として最小輝度レベル検出とＡＰＬ検出と
したが、これは画像の情報を検出する方法であれば例え
ば白ピーク検出やヒストグラム検出等でも良い。
【００２２】
【発明の効果】以上のように本発明は画像範囲出力回
路、画像情報検出回路、ＥＤＴＶ２判別回路、画質補正
回路という構成を設けることにより、表示画面と異なる
アスペクト比の映像信号を入力した場合でも最適な画像
情報検出を行うことの出来る映像信号の画像情報検出装
置を提供することができる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal image information detecting apparatus used for improving the image quality of a television. 2. Description of the Related Art In recent years, as color television receivers have become larger in size, various types of color television receivers have been developed to prevent image collapse and black floating, improve gradation, and realize higher quality images. The image quality correction device is regarded as important. Hereinafter, an example of the above-described conventional image quality correcting apparatus will be described with reference to the drawings. FIG. 6 shows a characteristic diagram of a black level correction circuit which is one of the conventional image quality correction devices. When the input signal is a luminance signal, the horizontal axis in FIG. 6 is the input signal level of the black level correction circuit, the vertical axis is the output signal level, 1 is the minimum luminance level of the input signal, and 2 is when no correction processing is performed. That is, the input / output characteristics when a signal is output at the same luminance level as the luminance level of the input signal, and 3 indicates the input / output characteristics after the black level correction processing. The operation of the above-described black level correction circuit of the image quality correction apparatus will be described below with reference to a characteristic diagram. In the characteristic diagram of the black level correction circuit shown in FIG. 6, if there is a minimum luminance level as indicated by the symbol A, a screen appears as if black were floating as it is. Therefore, in order to improve the gradation of the video, the minimum luminance level may be reduced to a level near the pedestal level which is lower than the level at the time of input and has no level fluctuation due to the black level correction. This will be described with reference to the characteristic diagram of FIG. 6. In this case, the slope of the uncorrected characteristic waveform denoted by reference character B is set to be corrected so that the minimum luminance level is close to the pedestal level. The input / output characteristic waveform after this correction is denoted by reference character C. By processing the luminance signal in the black level correction circuit as described above, floating of black can be prevented, and the gradation of the black portion can be improved. The effect of this correction is the average luminance level (Average Picture).
As the re level (hereinafter, referred to as APL) increases, the control is performed so as to increase. [0007] However, in the above-described circuit, when a video signal having a horizontally long aspect ratio such as a Vista size is input to a display screen having an aspect ratio of 4: 3 as shown in FIG. In the case of an image having black bands on the upper and lower sides of the screen, or an image having side panels on the left and right sides of the screen when a video signal having an aspect ratio of 4: 3 is input to a display screen having an aspect ratio of 16: 9 as shown in FIG. In the case of, malfunction may occur. The reason is that the detection processing of the image information such as the minimum luminance level and the APL detection voltage required for performing the black level correction must be performed within a certain range of the actual video signal indicated by the symbol a in FIGS. In addition, the detection processing is performed also on the black band on the upper and lower sides or the left and right sides of the screen other than the range of a. For example, the minimum luminance level detection circuit may detect the luminance level of the black band portion without detecting the minimum luminance level of the video signal, or the APL detection voltage may be lower than the original detection voltage. is there. Due to the malfunction of the detection circuit, there is a problem that the black level correction does not operate normally. The present invention has been made in view of the above problems, and provides an image signal image information detecting device capable of performing normal image information detection even when an image signal having a different aspect ratio from a display screen is input. [0009] In order to solve the above-mentioned problems, an apparatus for detecting image information of a video signal according to the present invention comprises a horizontal position which is fixed so as to have an aspect ratio of 16: 9 and is set in advance. A first image range output circuit for outputting a range in which image information is detected from an input video signal by using the vertical position and a vertical position; determining a luminance level of the input video signal;
Determine whether there is a black band below or on the left and right.
If there is no black band at the top and bottom or left and right of the signal screen, the entire table
Detects image information from the input video signal for the display screen
Output the range, up or down or left and right on the screen of the input video signal
When there is a black band portion, the horizontal and vertical positions of the video portion excluding the vertical and horizontal black bands on the screen with respect to the display screen are detected from the input video signal, and image information is detected from the input video signal. A second image range output circuit that outputs a range, and an image range output of a first image range signal or a second image range signal output from the first image range output circuit or the second image range output circuit An image information detection circuit for detecting image information necessary for image quality correction from an input video signal within a range of; an image quality correction circuit for correcting the input video signal to an optimal image quality using the detected image information; and an input video signal. the aspect ratio of 16: 9 whether EDTV 2 video signal and a determining discrimination circuit according to the presence or absence of the identification signal, before
In the discrimination circuit, the aspect ratio of the input video signal is 1
Identification signal indicating that it is a 6: 9 EDTV2 video signal
When it is determined that there is no signal, image information necessary for image quality correction is detected from the input video signal within the range of the second image range output output from the second image range output circuit, , The aspect ratio of the input video signal is 1
When it is determined that there is an identification signal indicating that the video signal is a 6: 9 EDTV2 video signal, regardless of whether the aspect ratio of the input video signal is different from or the same as the aspect ratio of the display screen, the first signal is output. In the present invention, image information necessary for image quality correction is detected from an input video signal within a preset first image range output from an image range output circuit. According to the present invention, the range of the original video portion excluding the upper, lower, left and right screen black portions from the input video signal is output from the image range output circuit. Various image information necessary for image quality correction such as a minimum luminance level is detected from an input signal by an image information detection circuit. Using the detected data, an input signal is corrected by an image quality correction circuit so as to obtain an optimum image quality and output. Also, ED
The TV2 discriminating circuit detects the presence or absence of the EDTV2 identification signal of the input signal. If the identification signal is present (when receiving the EDTV2 video), the image range whose aspect ratio is fixed to 16: 9 is output from the image range output circuit. Within this range, various image information is detected from the input signal by the image information detection circuit, and the input signal is corrected and output by the image quality correction circuit using this data. In this way, an image signal image information detecting device capable of detecting normal image information even when an image signal having an aspect ratio different from that of the display screen is input can be configured. An embodiment of the present invention will be described below with reference to the accompanying drawings. (Embodiment 1) FIG. 1 is a block diagram showing the arrangement of a video signal image information detecting apparatus according to a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes an image range output circuit, which determines a range for detecting image information from a preset horizontal position and vertical position, and outputs an image range output b. Reference numeral 2 denotes an image information detection circuit, and an image range output b
And detects image information from the video signal a and outputs image information detection data c. Reference numeral 3 denotes an image quality correction circuit that corrects the video signal a to an optimum image quality using the image information detection data c. The operation of the image signal image information detecting apparatus configured as described above will be described below with reference to FIG. To detect image information required for image quality correction,
It is necessary to specify the range of image information detection. So Figure 1
In the image range output circuit 1, a horizontal position and a vertical position are set in advance so that detection can be performed on the entire display screen. Based on this position, the image information detection range is determined and an image range output b is output. Within this range, various image information is detected from the input video signal a by the image information detection circuit 2 and the detection result obtained is obtained. Output as image information detection data c. Reference numeral 3 denotes an image quality correction circuit which corrects the video signal a to an optimum image quality using the image information detection data c and outputs a video signal output d. As described above, according to the present embodiment, the image information detecting circuit is used by using the image range output from the image information output circuit, and the image signal is corrected and output by the image quality correcting circuit, so that the optimum image signal is output. It is possible to provide a video signal image information detecting device capable of performing various image information detections. (Embodiment 2) Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a block diagram showing the arrangement of a video signal image information detecting apparatus according to a second embodiment of the present invention. In FIG. 2, reference numeral 1 denotes an image range output circuit which detects an image portion excluding a black band portion from an input video signal a and outputs the detected image portion as an image range output b. Reference numeral 2 denotes an image information detection circuit which detects various types of image information from an input video signal a within an image range output b and outputs image information detection data c. Reference numeral 3 denotes an image quality correction circuit which corrects the video signal a to an optimum image quality using the image information detection data c and outputs a video signal output d. The operation of the apparatus for detecting image information of a video signal configured as described above will be described below with reference to FIGS. FIG. 3 shows the relationship between the display screen and the input image. A1 indicates a display screen, and A2 indicates an image range when an image having an aspect ratio different from that of the display screen is input. Here, when a video signal having the same aspect ratio as that of the display screen is input, since there is a video from end to end of the screen in both horizontal and vertical directions, the entire display screen (A1 in FIG. 3) is used as in the first embodiment. The image information of the input signal may be detected in the range of the input signal. However, when video signals having different aspect ratios are input, the actual image is only in the range of A2, and the image is displayed in other shaded portions in FIG. No (the video signal level is the same as the pedestal level). If image information is detected in the range of A1 in this state, all hatched portions are determined to be "black" and detected. For example, when detecting the minimum luminance level of the input video, if the luminance level of the hatched portion is lower than the minimum luminance level of the video portion in the range of A2 in FIG. 3, the luminance of the hatched portion is set as the minimum luminance level of this video. When the APL of the input image is detected or the APL of the input image is detected, the hatched portion is also detected as a black image portion, and the APL detection value is lower than the APL of the image in the original range of A2. Then, it is necessary to stop the image information detecting operation. Then, the luminance level of the input video signal a is determined, and if there is a continuous black portion at the top and bottom or left and right of the screen, this is determined to be a portion corresponding to the hatched portion in FIG. The image range output circuit 1 detects the horizontal position and the vertical position of the image in the range A2. When the range of A2 changes, the horizontal position and the vertical position are detected each time, and only the image portion of the input signal is always detected, and this detection result is output as an image range output b. Image information detection is performed by the image information detection circuit 2 within the range of the output data, and image information detection is not performed outside the range of the detection data. The detection result obtained here is output as image information detection data c, and based on this data, the image signal a is corrected to the optimum image quality by the image quality correction circuit 3 and the image signal output d is output. As described above, according to the present embodiment, an image information detection circuit is performed using an image range output corresponding to an input image obtained by an image range output circuit, and a video signal is corrected by an image quality correction circuit. By outputting the image signal, it is possible to provide an image signal image information detecting device capable of performing optimal image information detection even when an image signal having an aspect ratio different from that of the display screen is input. (Embodiment 3) Hereinafter, a third embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a block diagram of an apparatus for detecting image information of a video signal according to a third embodiment of the present invention. In FIG. 4, 4 is an EDTV
This circuit determines whether or not the input video signal is EDTV2 and outputs the result as EDTV2 determination data h. Reference numeral 1 denotes an image range output circuit which outputs an image range output b by fixing the aspect ratio of the image range for performing image information detection to 16: 9 when it is determined from the EDTV2 determination data h that the input video signal is EDTV2. I do. Reference numeral 2 denotes an image information detection circuit which detects image information from the video signal a within the range of the image range output b and outputs image information detection data c
Is output. Reference numeral 3 denotes an image quality correction circuit which corrects the video signal a to an optimum image quality using the image information detection data c and outputs a video signal output d. The operation of the apparatus for detecting image information of a video signal configured as described above will be described below with reference to FIGS. The image range output circuit 1 of FIG. 4 outputs an image range output b as in the first and second embodiments. However, depending on the input video, this range detection malfunctions and a range different from the actual image is output. There is. For example, in the case where the moon is appearing in the night sky as shown in FIG. 5 when the aspect ratio of the display screen and the input video are the same, despite the fact that there is no portion corresponding to the hatched portion in FIG. Since the upper, lower, left, and right night sky portions are discriminated as hatched portions, an erroneous image range output may be output from the image range output circuit 1. However, if the aspect ratio of the input video signal is known in advance. If the image range output b
Is output in accordance with the aspect ratio, such a malfunction can be prevented. Here, ED is used as an input signal with a fixed aspect ratio and no video in other parts.
There is a TV2 signal. EDTV2 signals have an aspect ratio of 1
6: 9, and an EDTV2 discrimination control signal is inserted into the EDTV2 signal in the vertical blanking periods 22H and 285H. When this control signal is decoded, EDTV
2 Identification signals can be detected. With this EDTV2 identification signal, E
It is possible to determine whether it is DTV2. Therefore, the EDTV2 discriminating circuit shown in FIG.
A DTV2 identification signal is detected, it is determined whether or not it is EDTV2, and EDTV2 determination data h is output. If it can be determined from this determination result that the input video signal is EDTV2, the image range output circuit 1 outputs an image range output b having an aspect ratio fixed to 16: 9 to prevent a malfunction in image range detection due to the input video. are doing. The operations from the image range output circuit 1 to the image quality correction circuit 3 when a video other than the EDTV 2 is input are the same as those in the first and second embodiments. As described above, according to this embodiment, the EDTV
When the input signal is determined to be an EDTV2 signal by the 2 discriminating circuit, an image range output having an aspect ratio of 16: 9 is output from the image information output circuit, and an image information detecting circuit is performed using the image range data. Provided is a video signal image information detection device which can correct a video signal with an image quality correction circuit and output it, thereby preventing a malfunction of image range detection when an EDTV2 video signal is input, and constantly performing stable image information detection. can do. Although the input signal is a video signal in the first, second and third embodiments, it may be a luminance signal, a chrominance signal, a color difference signal or a primary color signal. Similarly, the image information detection is performed by, for example, the minimum luminance level detection and the APL detection. However, any method of detecting image information, such as white peak detection or histogram detection, may be used. As described above, the present invention provides an image range output circuit, an image information detection circuit, an EDTV2 discriminating circuit, and an image quality correction circuit to input a video signal having an aspect ratio different from that of a display screen. In this case, it is possible to provide an image signal image information detecting device capable of performing optimal image information detection.
【図面の簡単な説明】
【図１】本発明の第１の実施例における映像信号の画像
情報検出装置のブロック図
【図２】本発明の第２の実施例における映像信号の画像
情報検出装置のブロック図
【図３】表示画面と異なるアスペクト比の映像を入力し
た場合の画面の概念図
【図４】本発明の第３の実施例における映像信号の画像
情報検出装置のブロック図
【図５】画像範囲検出時に誤動作しやすいシーンのイメ
ージ図（夜空の月のシーン）
【図６】従来の映像信号の画質補正装置における黒レベ
ル補正の入出力特性図
【図７】アスペクト比４：３の画面に横長映像を表示し
た場合の画面の概念図
【図８】アスペクト比１６：９の画面に４：３映像を表
示した場合の画面の概念図
【符号の説明】
１ 画像範囲出力回路
２ 画像情報検出回路
３ 画質補正回路
４ ＥＤＴＶ２判別回路BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a video signal image information detecting device according to a first embodiment of the present invention. FIG. 2 is a video signal image information detecting device according to a second embodiment of the present invention. FIG. 3 is a conceptual diagram of a screen when an image having an aspect ratio different from that of a display screen is input. FIG. 4 is a block diagram of a video signal image information detecting device according to a third embodiment of the present invention. FIG. 6 is an image diagram of a scene that is likely to malfunction when detecting an image range (a night sky moon scene). FIG. 6 is an input / output characteristic diagram of black level correction in a conventional video signal image quality correction device. FIG. 7 is a screen with an aspect ratio of 4: 3. Fig. 8 is a conceptual diagram of a screen when a landscape image is displayed on a screen. Fig. 8 is a conceptual diagram of a screen when a 4: 3 image is displayed on a screen with an aspect ratio of 16: 9. Detection circuit 3 Image quality correction Road 4 EDTV2 discriminating circuit
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平５−191674（ＪＰ，Ａ) 特開 平５−27736（ＪＰ，Ａ) 特開 平２−119470（ＪＰ，Ａ) ────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-5-191674 (JP, A) JP-A-5-27736 (JP, A) JP-A-2-119470 (JP, A)
Claims (1)
定してあらかじめ設定した水平位置と垂直位置を使用し
て入力映像信号から画像情報の検出を行う範囲を出力す
る第１の画像範囲出力回路と、前記入力映像信号の輝度
レベルを判定し、画面上下又は左右に黒帯部分があるか
を判定し、前記入力映像信号の画面上下又は左右に黒帯
部分がない場合には全表示画面に対する入力映像信号か
ら画像情報の検出を行う範囲を出力し、前記入力映像信
号の画面上下又は左右に黒帯部分がある場合には前記入
力映像信号から画面上下又は左右の黒帯部分を除いた映
像部分の前記表示画面に対する水平位置と垂直位置を検
出して入力映像信号から画像情報の検出を行う範囲を出
力する第２の画像範囲出力回路と、前記第１の画像範囲
出力回路又は第２の画像範囲出力回路から出力される第
１の画像範囲信号又は第２の画像範囲信号の画像範囲出
力の範囲内で入力映像信号から画質補正に必要な画像情
報を検出する画像情報検出回路と、検出された画像情報
を用いて入力映像信号を最適な画質に補正する画質補正
回路と、入力映像信号のアスペクト比が１６：９のＥＤ
ＴＶ２の映像信号か否かを識別信号の有無により判定す
る判別回路とを備え、前記判別回路において、入力映像
信号のアスペクト比が１６：９のＥＤＴＶ２の映像信号
であることを示す識別信号が無しと判定された時には、
前記第２の画像範囲出力回路から出力される第２の画像
範囲出力の範囲内で入力映像信号から画質補正に必要な
画像情報を検出し、前記判別回路において、入力映像信
号のアスペクト比が１６：９のＥＤＴＶ２の映像信号で
あることを示す識別信号が有りと判定された時には、入
力映像信号のアスペクト比と表示画面のアスペクト比と
異なるか同じであるかに関わらず、前記第１の画像範囲
出力回路から出力されるあらかじめ設定された第１の画
像範囲内で入力映像信号から画質補正に必要な画像情報
を検出するようにしたことを特徴とする映像信号の画像
情報検出装置。(57) [Claims 1] A range in which image information is detected from an input video signal using a preset horizontal position and vertical position fixed to an aspect ratio of 16: 9. A first image range output circuit for outputting the luminance of the input video signal
Judge the level and check if there is a black band at the top, bottom, left or right of the screen
And black bars on the top and bottom or left and right of the screen of the input video signal
If there is no part, it is the input video signal for the entire display screen
Output the range in which image information is detected from the input video signal.
If there is a black band at the top and bottom or left and right of the screen of the signal, the input video signal is detected by detecting the horizontal and vertical positions of the video portion excluding the top and bottom or left and right black bands from the input video signal with respect to the display screen. A second image range output circuit for outputting a range in which image information is detected from the first image range output circuit or the first image range signal or the second image range signal output from the second image range output circuit. An image information detection circuit that detects image information necessary for image quality correction from an input video signal within an image range output range of an image range signal, and an image quality that corrects the input video signal to an optimum image quality using the detected image information Correction circuit and ED with aspect ratio of input video signal of 16: 9
Whether TV 2 video signal and a determining discrimination circuit according to the presence or absence of the identification signal, in the discriminating circuit, the input video
EDTV2 video signal with 16: 9 aspect ratio
When it is determined that there is no identification signal indicating that
The image information necessary for image quality correction is detected from the input video signal within the range of the second image range output from the second image range output circuit, and the aspect ratio of the input video signal is set to 16 in the determination circuit. : 9 is determined to be present, regardless of whether the aspect ratio of the input video signal and the aspect ratio of the display screen are different or the same, regardless of whether the identification signal indicates that the video signal is an EDTV2 video signal. A video signal image information detecting device, wherein image information necessary for image quality correction is detected from an input video signal within a preset first image range output from a range output circuit.
Priority Applications (10)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07709194A JP3429842B2 (en) | 1994-04-15 | 1994-04-15 | Image information detection device for video signal |
| CN94118051A CN1075314C (en) | 1994-04-15 | 1994-11-10 | Picture information detection apparatus for video signal |
| TW083110532A TW320812B (en) | 1994-04-15 | 1994-11-14 | |
| AU81568/94A AU684572B2 (en) | 1994-04-15 | 1994-12-20 | Picture information detecting apparatus |
| EP95300019A EP0677959B1 (en) | 1994-04-15 | 1995-01-03 | Picture information detecting apparatus for a video signal |
| DE69508833T DE69508833T2 (en) | 1994-04-15 | 1995-01-03 | Device for detecting image information for a video signal |
| MYPI95000380A MY115945A (en) | 1994-04-15 | 1995-02-16 | Picture information detecting apparatus for a video signal |
| CA002147058A CA2147058C (en) | 1994-04-15 | 1995-04-13 | Picture information detecting apparatus for a video signal |
| KR1019950008744A KR100201021B1 (en) | 1994-04-15 | 1995-04-14 | Picture information detecting apparatus for a video signal |
| US08/852,670 US5748257A (en) | 1994-04-15 | 1997-05-07 | Picture information detecting apparatus for a video signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07709194A JP3429842B2 (en) | 1994-04-15 | 1994-04-15 | Image information detection device for video signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07288751A JPH07288751A (en) | 1995-10-31 |
| JP3429842B2 true JP3429842B2 (en) | 2003-07-28 |
Family
ID=13624118
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07709194A Expired - Fee Related JP3429842B2 (en) | 1994-04-15 | 1994-04-15 | Image information detection device for video signal |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US5748257A (en) |
| EP (1) | EP0677959B1 (en) |
| JP (1) | JP3429842B2 (en) |
| KR (1) | KR100201021B1 (en) |
| CN (1) | CN1075314C (en) |
| AU (1) | AU684572B2 (en) |
| CA (1) | CA2147058C (en) |
| DE (1) | DE69508833T2 (en) |
| MY (1) | MY115945A (en) |
| TW (1) | TW320812B (en) |
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|---|---|---|---|---|
| US8098328B2 (en) | 2006-06-08 | 2012-01-17 | Sony Corporation | Image signal processing apparatus, image display and image display method |
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| US6002797A (en) * | 1994-06-22 | 1999-12-14 | Hitachi, Ltd. | Apparatus for detecting position of featuring region of picture, such as subtitle or imageless part |
| WO1999013450A1 (en) * | 1997-09-05 | 1999-03-18 | Sony Corporation | A method and apparatus for displaying images |
| EP0963111A1 (en) * | 1998-06-02 | 1999-12-08 | Deutsche Thomson-Brandt Gmbh | Method and apparatus for dynamic contrast improvement in video pictures |
| EP1372340B1 (en) * | 1998-06-02 | 2006-12-13 | Deutsche Thomson-Brandt Gmbh | Method and apparatus for dynamic contrast improvement in video pictures |
| FR2793375A1 (en) * | 1999-05-06 | 2000-11-10 | Thomson Multimedia Sa | METHOD FOR DETECTING BLACK BANDS IN A VIDEO IMAGE |
| KR100346840B1 (en) * | 1999-11-04 | 2002-08-03 | 삼성전자 주식회사 | Black expander for minimizing flickering of screen, and method there-of |
| JP3986732B2 (en) * | 2000-06-21 | 2007-10-03 | パイオニア株式会社 | Brightness level correction device for video signal |
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- 1994-11-14 TW TW083110532A patent/TW320812B/zh not_active IP Right Cessation
- 1994-12-20 AU AU81568/94A patent/AU684572B2/en not_active Expired
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1995
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- 1995-01-03 EP EP95300019A patent/EP0677959B1/en not_active Expired - Lifetime
- 1995-02-16 MY MYPI95000380A patent/MY115945A/en unknown
- 1995-04-13 CA CA002147058A patent/CA2147058C/en not_active Expired - Lifetime
- 1995-04-14 KR KR1019950008744A patent/KR100201021B1/en active IP Right Grant
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1997
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| US8098328B2 (en) | 2006-06-08 | 2012-01-17 | Sony Corporation | Image signal processing apparatus, image display and image display method |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0677959A1 (en) | 1995-10-18 |
| TW320812B (en) | 1997-11-21 |
| KR950030597A (en) | 1995-11-24 |
| CN1075314C (en) | 2001-11-21 |
| DE69508833T2 (en) | 1999-08-05 |
| DE69508833D1 (en) | 1999-05-12 |
| AU8156894A (en) | 1995-10-26 |
| KR100201021B1 (en) | 1999-06-15 |
| MY115945A (en) | 2003-10-31 |
| EP0677959B1 (en) | 1999-04-07 |
| US5748257A (en) | 1998-05-05 |
| CA2147058A1 (en) | 1995-10-16 |
| CN1111047A (en) | 1995-11-01 |
| JPH07288751A (en) | 1995-10-31 |
| AU684572B2 (en) | 1997-12-18 |
| CA2147058C (en) | 2001-06-05 |
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